The reflectivity of an object determines its ability to reflect its surroundings. To make an object more reflective, increase the reflectivity of its material.
The surface of the reflective object will affect the clarity of the reflection. On a smooth surface light bounces off the surface of a material at an angle equal to the angle of the incoming light wave. This results in a clear reflection.
On a rough surface (such as a surface in Showcase that has a Bump texture) light waves bounce off at many angles because the surface is uneven (this is also called scatter). Reflections on this type of surface will appear distorted or blurred.
When a bright light (sunlight, spotlight, and so on) reflects off a surface, a specular highlight results. In another words, highlights are the hotspots where light is reflected off an object.
In the following image, the highlight value was increased for each object from left to right.
